staging: unisys: visorbus: Remove confusing comment in controlvmchannel.

Referencing a SegmentIndex doesn't make sense in the Linux drivers, get rid
of the comment.
Reviewed-by: Sameer Wadgaonkar <sameer.wadgaonkar@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorbus/controlvmchannel.h

@@ -273,7 +273,6 @@ struct controlvm_packet_device_create  {
  */
 struct controlvm_packet_device_configure  {
 	u32 bus_no;
-	/* Control uses header SegmentIndex field to access bus number. */
 	u32 dev_no;
 } __packed;